﻿var MrYangUtil = function() {

    /***
    * 获得当前时间
    */
    this.getCurrentDate = function() {
        return new Date();
    };

    this.Todate = function(num) { //Fri Oct 31 18:00:00 UTC+0800 2008
        num = num + "";
        var date = "";
        var month = new Array();
        month["Jan"] = 1; month["Feb"] = 2; month["Mar"] = 3; month["Apr"] = 4; month["May"] = 5; month["Jan"] = 6;
        month["Jul"] = 7; month["Aug"] = 8; month["Sep"] = 9; month["Oct"] = 10; month["Nov"] = 11; month["Dec"] = 12;
        var week = new Array();
        week["Mon"] = "一"; week["Tue"] = "二"; week["Wed"] = "三"; week["Thu"] = "四"; week["Fri"] = "五"; week["Sat"] = "六"; week["Sun"] = "日";

        str = num.split(" ");
        date = str[3] + "-";
        var count = strlen(month[str[1]]);
        var m = month[str[1]];
        if (count = 1) {
            m = "0" + month[str[1]];
        }
        date = date + m + "-" + str[2];
        return date;
    }

    function strlen(str) {
        var len = 0;
        for (var i = 0; i < str.length; i++) {
            var c = str.charCodeAt(i);
            //单字节加1 
            if ((c >= 0x1 && c <= 0x007e)(0xff60 <= c && c <= 0xff9f)) {
                len++;
            }
            else {
                len += 2;
            }
        }
        return len;
    }


    //获得某月的开始日期　　
    this.getMonthStartDate = function(paraYear, paraMonth) {
        var monthStartDate = new Date(paraYear, paraMonth, 1);
        return formatDate(monthStartDate);
    }
    //获得某月的结束日期　　
    this.getMonthEndDate = function(paraYear, paraMonth) {
        var monthEndDate = new Date(paraYear, paraMonth, getMonthDays(paraYear, paraMonth));
        return formatDate(monthEndDate);
    }

    this.getMonthDays = function(paraYear, paraMonth) {
        var monthStartDate = new Date(paraYear, paraMonth, 1);
        var monthEndDate = new Date(paraYear, paraMonth + 1, 1);
        var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
        return days;
    }

    /***
    * 获得本周起止时间
    */
    this.getCurrentWeek = function() {
        //起止日期数组  
        var startStop = new Array();
        //获取当前时间  
        var currentDate = this.getCurrentDate();
        //返回date是一周中的某一天  
        var week = currentDate.getDay();
        //返回date是一个月中的某一天  
        var month = currentDate.getDate();

        //一天的毫秒数  
        var millisecond = 1000 * 60 * 60 * 24;
        //减去的天数  
        var minusDay = week != 0 ? week - 1 : 6;
        //alert(minusDay);  
        //本周 周一  
        var monday = new Date(currentDate.getTime() - (minusDay * millisecond));
        //本周 周日  
        var sunday = new Date(monday.getTime() + (6 * millisecond));
        //添加本周时间  
        startStop.push(monday); //本周起始时间  
        //添加本周最后一天时间  
        startStop.push(sunday); //本周终止时间  
        //返回  
        return startStop;
    };

    /***
    * 获得本月的起止时间
    */
    this.getCurrentMonth = function() {
        //起止日期数组  
        var startStop = new Array();
        //获取当前时间  
        var currentDate = this.getCurrentDate();
        //获得当前月份0-11  
        var currentMonth = currentDate.getMonth();
        //获得当前年份4位年  
        var currentYear = currentDate.getFullYear();
        //求出本月第一天  
        var firstDay = new Date(currentYear, currentMonth, 1);


        //当为12月的时候年份需要加1  
        //月份需要更新为0 也就是下一年的第一个月  
        if (currentMonth == 11) {
            currentYear++;
            currentMonth = 0; //就为  
        } else {
            //否则只是月份增加,以便求的下一月的第一天  
            currentMonth++;
        }


        //一天的毫秒数  
        var millisecond = 1000 * 60 * 60 * 24;
        //下月的第一天  
        var nextMonthDayOne = new Date(currentYear, currentMonth, 1);
        //求出上月的最后一天  
        var lastDay = new Date(nextMonthDayOne.getTime() - millisecond);

        //添加至数组中返回  
        startStop.push(firstDay);
        startStop.push(lastDay);
        //返回  
        return startStop;
    };

    /**
    * 得到本季度开始的月份
    * @param month 需要计算的月份
    ***/
    this.getQuarterSeasonStartMonth = function(month) {
        var quarterMonthStart = 0;
        var spring = 0; //春  
        var summer = 3; //夏  
        var fall = 6;   //秋  
        var winter = 9; //冬  
        //月份从0-11  
        if (month < 3) {
            return spring;
        }

        if (month < 6) {
            return summer;
        }

        if (month < 9) {
            return fall;
        }

        return winter;
    };

    /**
    * 获得该月的天数
    * @param year年份
    * @param month月份
    * */
    this.getMonthDays = function(year, month) {
        //本月第一天 1-31  
        var relativeDate = new Date(year, month, 1);
        //获得当前月份0-11  
        var relativeMonth = relativeDate.getMonth();
        //获得当前年份4位年  
        var relativeYear = relativeDate.getFullYear();

        //当为12月的时候年份需要加1  
        //月份需要更新为0 也就是下一年的第一个月  
        if (relativeMonth == 11) {
            relativeYear++;
            relativeMonth = 0;
        } else {
            //否则只是月份增加,以便求的下一月的第一天  
            relativeMonth++;
        }
        //一天的毫秒数  
        var millisecond = 1000 * 60 * 60 * 24;
        //下月的第一天  
        var nextMonthDayOne = new Date(relativeYear, relativeMonth, 1);
        //返回得到上月的最后一天,也就是本月总天数  
        return new Date(nextMonthDayOne.getTime() - millisecond).getDate();
    };

    /**
    * 获得本季度的起止日期
    */
    this.getCurrentSeason = function() {
        //起止日期数组  
        var startStop = new Array();
        //获取当前时间  
        var currentDate = this.getCurrentDate();
        //获得当前月份0-11  
        var currentMonth = currentDate.getMonth();
        //获得当前年份4位年  
        var currentYear = currentDate.getFullYear();
        //获得本季度开始月份  
        var quarterSeasonStartMonth = this.getQuarterSeasonStartMonth(currentMonth);
        //获得本季度结束月份  
        var quarterSeasonEndMonth = quarterSeasonStartMonth + 2;

        //获得本季度开始的日期  
        var quarterSeasonStartDate = new Date(currentYear, quarterSeasonStartMonth, 1);
        //获得本季度结束的日期  
        var quarterSeasonEndDate = new Date(currentYear, quarterSeasonEndMonth, this.getMonthDays(currentYear, quarterSeasonEndMonth));
        //加入数组返回  
        startStop.push(quarterSeasonStartDate);
        startStop.push(quarterSeasonEndDate);
        //返回  
        return startStop;
    };

    /***
    * 得到本年的起止日期
    * 
    */
    this.getCurrentYear = function() {
        //起止日期数组  
        var startStop = new Array();
        //获取当前时间  
        var currentDate = this.getCurrentDate();
        //获得当前年份4位年  
        var currentYear = currentDate.getFullYear();

        //本年第一天  
        var currentYearFirstDate = new Date(currentYear, 0, 1);
        //本年最后一天  
        var currentYearLastDate = new Date(currentYear, 11, 31);
        //添加至数组  
        startStop.push(currentYearFirstDate);
        startStop.push(currentYearLastDate);
        //返回  
        return startStop;
    };

    /**
    * 返回上一个月的第一天Date类型
    * @param year 年
    * @param month 月
    **/
    this.getPriorMonthFirstDay = function(year, month) {
        //年份为0代表,是本年的第一月,所以不能减  
        if (month == 0) {
            month = 11; //月份为上年的最后月份  
            year--; //年份减1  
            return new Date(year, month, 1);
        }
        //否则,只减去月份  
        month--;
        return new Date(year, month, 1); ;
    };

    /**
    * 获得上一月的起止日期
    * ***/
    this.getPreviousMonth = function() {
        //起止日期数组  
        var startStop = new Array();
        //获取当前时间  
        var currentDate = this.getCurrentDate();
        //获得当前月份0-11  
        var currentMonth = currentDate.getMonth();
        //获得当前年份4位年  
        var currentYear = currentDate.getFullYear();
        //获得上一个月的第一天  
        var priorMonthFirstDay = this.getPriorMonthFirstDay(currentYear, currentMonth);
        //获得上一月的最后一天  
        var priorMonthLastDay = new Date(priorMonthFirstDay.getFullYear(), priorMonthFirstDay.getMonth(), this.getMonthDays(priorMonthFirstDay.getFullYear(), priorMonthFirstDay.getMonth()));
        //添加至数组  
        startStop.push(priorMonthFirstDay);
        startStop.push(priorMonthLastDay);
        //返回  
        return startStop;
    };


    /**
    * 获得上一周的起止日期
    * **/
    this.getPreviousWeek = function() {
        //起止日期数组  
        var startStop = new Array();
        //获取当前时间  
        var currentDate = this.getCurrentDate();
        //返回date是一周中的某一天  
        var week = currentDate.getDay();
        //返回date是一个月中的某一天  
        var month = currentDate.getDate();
        //一天的毫秒数  
        var millisecond = 1000 * 60 * 60 * 24;
        //减去的天数  
        var minusDay = week != 0 ? week - 1 : 6;
        //获得当前周的第一天  
        var currentWeekDayOne = new Date(currentDate.getTime() - (millisecond * minusDay));
        //上周最后一天即本周开始的前一天  
        var priorWeekLastDay = new Date(currentWeekDayOne.getTime() - millisecond);
        //上周的第一天  
        var priorWeekFirstDay = new Date(priorWeekLastDay.getTime() - (millisecond * 6));

        //添加至数组  
        startStop.push(priorWeekFirstDay);
        startStop.push(priorWeekLastDay);

        return startStop;
    };

    /**
    * 得到上季度的起始日期
    * year 这个年应该是运算后得到的当前本季度的年份
    * month 这个应该是运算后得到的当前季度的开始月份
    * */
    this.getPriorSeasonFirstDay = function(year, month) {
        var quarterMonthStart = 0;
        var spring = 0; //春  
        var summer = 3; //夏  
        var fall = 6;   //秋  
        var winter = 9; //冬  
        //月份从0-11  
        switch (month) {//季度的其实月份  
            case spring:
                //如果是第一季度则应该到去年的冬季  
                year--;
                month = winter;
                break;
            case summer:
                month = spring;
                break;
            case fall:
                month = summer;
                break;
            case winter:
                month = fall;
                break;

        };

        return new Date(year, month, 1);
    };

    /**
    * 得到上季度的起止日期
    * **/
    this.getPreviousSeason = function() {
        //起止日期数组  
        var startStop = new Array();
        //获取当前时间  
        var currentDate = this.getCurrentDate();
        //获得当前月份0-11  
        var currentMonth = currentDate.getMonth();
        //获得当前年份4位年  
        var currentYear = currentDate.getFullYear();
        //上季度的第一天  
        var priorSeasonFirstDay = this.getPriorSeasonFirstDay(currentYear, currentMonth);
        //上季度的最后一天  
        var priorSeasonLastDay = new Date(priorSeasonFirstDay.getFullYear(), priorSeasonFirstDay.getMonth() + 2, this.getMonthDays(priorSeasonFirstDay.getFullYear(), priorSeasonFirstDay.getMonth() + 2));
        //添加至数组  
        startStop.push(priorSeasonFirstDay);
        startStop.push(priorSeasonLastDay);
        return startStop;
    };

    /**
    * 得到去年的起止日期
    * **/
    this.getPreviousYear = function() {
        //起止日期数组  
        var startStop = new Array();
        //获取当前时间  
        var currentDate = this.getCurrentDate();
        //获得当前年份4位年  
        var currentYear = currentDate.getFullYear();
        currentYear--;
        var priorYearFirstDay = new Date(currentYear, 0, 1);
        var priorYearLastDay = new Date(currentYear, 11, 1);
        //添加至数组  
        startStop.push(priorYearFirstDay);
        startStop.push(priorYearLastDay);
        return startStop;
    };





}; 